Holiday Hills is a village in McHenry County, Illinois, United States. The population was 610 at the 2010 census.
Holiday Hills is located at 42°17′38″N 88°13′37″W (42.293972, -88.226833).
According to the 2010 census, Holiday Hills has a total area of 0.99 square miles (2.56 km2), of which 0.95 square miles (2.46 km2) (or 95.96%) is land and 0.04 square miles (0.10 km2) (or 4.04%) is water.
As of the census of 2000, there were 831 people, 280 households, and 225 families residing in the village. The population density was 877.7 people per square mile (337.7/km2). There were 289 housing units at an average density of 305.2 per square mile (117.5/km2). The racial makeup of the village was 94.46% White, 1.20% African American, 0.36% Native American, 0.36% Asian, 0.12% Pacific Islander, 3.01% from other races, and 0.48% from two or more races. Hispanic or Latino of any race were 5.17% of the population.
There were 280 households, out of which 41.4% had children under the age of 18 living with them, 65.7% were married couples living together, 10.0% had a female householder with no husband present, and 19.3% were non-families. 13.6% of all households were made up of individuals, and 2.1% had someone living alone who was 65 years of age or older. The average household size was 2.97 and the average family size was 3.22.